BIOSENSORS & BIOELECTRONICS
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2016
·
IF 7.476
Long Yang,Xiaoguang Xie,Le Cai,Xin Ran,Yucong Li,Tianpeng Yin,Hui Zhao,Can-Peng Li
This work reports a novel method for the determination of aconitine through the competitive host–guest interaction between p-sulfonated calix[8]arene (SCX8) and signal probe/target molecules by using SCX8 functionalized reduced graphene oxide (SCX8-RGO) as a receptor. Three dyes (ST, RhB , BRB) and aconitine were selected as the probe and target molecules, respectively. The formation of SCX8-RGO·ST, SCX8-RGO·RhB, and SCX8-RGO·BRB complexes greatly decreases the fluorescence emission of ST, RhB , and BRB. The aconitine/SCX8 complex possesses a higher binding constant than ST/SCX8, RhB/SCX8, and BRB/SCX8 complexes, thus the dye in the SCX8 cavity can be replaced by aconitine to revert the fluorescence emission of SCX8-RGO·dye, leading to a “switch–on” fluorescence response. The fluorescence intensity of SCX8-RGO·ST, SCX8-RGO·RhB, and SCX8-RGO·BRB complexes increased linearly with increasing concentration of aconitine ranging from 1.0 to 14.0 μM, 2.0–16.0 μM, and 1.0–16.0 μM, respectively. Based on the competitive host–guest interaction, the proposed detection method for aconitine showed detection limits of 0.28 μM, 0.60 μM, and 0.37 μM, respectively, and was successfully applied for the determination of aconitine in human serum samples with good recoveries from 95.1% to 104.8%. The proposed method showed high selectivity for aconitine beyond competitive binding analytes . In addition, the inclusion complex of the SCX8/aconitine was studied by the molecular docking and molecular dynamics simulation , which indicated that the phenyl ester group of the aconitine molecule was included into the SCX8 cavity.
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FOOD CHEMISTRY
·
2016
·
IF 4.052
Haiyun Zhai,Lu Huang,Zuanguang Chen,Zihao Su,Kaisong Yuan,Guohuan Liang,Yufang Pan
A novel solid-phase extraction chip embedded with array columns of molecularly imprinted polymer-coated silanized graphene oxide (GO/SiO 2 -MISPE) was established to detect trace rhodamine B (RB) in chili powder. GO/SiO 2 -MISPE monolithic columns for RB detection were prepared by optimizing the supporting substrate, template, and polymerizing monomer under mild water bath conditions. Adsorption capacity and specificity, which are critical properties for the application of the GO/SiO 2 -MISPE monolithic column, were investigated. GO/SiO 2 -MIP was examined by scanning electron microscopy (SEM) and Fourier transform-infrared spectroscopy. The recovery and the intraday and interday relative standard deviations for RB ranged from 83.7% to 88.4% and 2.5% to 4.0% and the enrichment factors were higher than 110-fold. The chip-based array columns effectively eliminated impurities in chili powder, indicating that the chip-based GO/SiO 2 -MISPE method was reliable for RB detection in food samples using high-performance liquid chromatography. Accordingly, this method has direct applications for monitoring potentially harmful dyes in processed food.
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MATERIALS & DESIGN
·
2017
·
IF 4.364
Bing Yu,Zhun Li,Hailin Cong,Guoling Li,Qiaohong Peng,Chengfeng Yang
A versatile porous adsorbent of sulfonated polystyrene/ferrosoferric oxide/diazoresin (SPS/Fe 3 O 4 /DR) nanocomposite microspheres with magnetic property and acidic/basic groups was prepared and applied for removal of different dyes from water. The adsorbent showed good adsorption performance due to its functional groups and strong adsorption forces. The selective removal of methylene blue (MB) from MB/methyl orange (MO) mixture can be realized using this adsorbent. The adsorption uptake capacity of the adsorbents was 223.71 mg/g and the removal efficiency was more than 90% even after five adsorption-desorption cycles. This adsorbent could be readily separated from solution within 2 min using a magnet. Furthermore, adsorption kinetics for SPS/Fe 3 O 4 /DR followed by the pseudo-second order model. Isothermal equilibrium data were fitted with Langmuir model, which indicated the adsorption process is the monolayer adsorption. This novel, low cost and high effective adsorbent possesses great potential in environmental pollution cleanup.
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CLEAN-Soil Air Water
·
2013
·Vol. 41
·期 10
·992-1001
·
IF 2.046
Sui Wang,Jing Wei,Shasha Lv,Zhiyong Guo,Feng Jiang
A magnetic-sulfonic graphene nanocomposite (G-SO 3 H/Fe 3 O 4 ) was synthesized and characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction. It was used for removal of three cationic dyes: safranine T (ST), neutral red (NR), victoria blue (VB), and three anionic dyes: methyl orange, brilliant yellow, and alizarin red, from environmental water. The experimental conditions were optimized, including pH, amount of adsorbent, adsorption kinetics, adsorption isotherms, ionic strength, etc. The results show that G-SO 3 H/Fe 3 O 4 can adsorb cationic dyes more efficiently and selectively than anionic dyes at pH 6.0. In the first 10 min of adsorption time, more than 93% of the cationic dyes were removed by the sorbent. Adsorption kinetics follow the pseudo-second-order kinetic model well. The adsorption isotherm coincided with Langmuir and Freundlich adsorption models. The maximum adsorption capacities of G-SO 3 H/Fe 3 O 4 for ST, NR, and VB dyes were 199.3, 216.8, and 200.6 mg g −1 . The adsorbed cationic dyes were eluted by using different pH values of ethanol as the solvent. The established method was simple, sensitive, and rapid, and was suitable for the adsorption of cationic dyes in environmental water.
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ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Li Zhang,Hetong Qi,Jie Hao,Lifen Yang,Ping Yu,Lanqun Mao
Developing water-stable and adaptive supramolecular materials is of great importance in various research fields. Here, we demonstrate a new kind of water-stable, adaptive, and electroactive supramolecular ionic materials (SIM) that is formed from the aqueous solutions of imidazolium-based dication and dianionic dye (i.e., 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid), ABTS) through ionic self-assembly. The formed SIM not only shows good thermostability and unique optical and electrochemical properties that are raised from precursors of the SIM, but also exhibits good water-stability, salt-stability, and adaptive encapsulation properties toward some heterocyclic cationic dye molecules. UV–vis and FT-IR results demonstrate that this encapsulation property is essentially based on the electrostatic interactions between the guest dye molecules and ABTS in the SIM. The application of the SIM prepared here is illustrated by the development of a new electrochemical sensor for NADH sensing at a low potential. This study not only opens a new avenue to the preparation of the supramolecular materials, but also provides a versatile platform for electrochemical (bio)sensing.
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MICROCHIMICA ACTA
·
2015
·Vol. 182
·期 13
·2313-2320
·
IF 3.741
Xu Yan,Jin Jingjie,Li Xianliang,Han Yide,Meng Hao,Song Chaosheng,Zhang Xia
We describe a facile method for the preparation of magnetic microparticles consisting of a metal-organic framework (MOF) of Cu(II)-BTC (BTC = 1,3,5-benzenetricarboxylate) for rapid magnetic solid-phase extraction (MSPE) of the dye Congo Red (CR) from aqueous solution. Magnetization of the MOF and solid-phase extraction of CR was simultaneously accomplished by mixing, under ultrasonication, the MOF and silica-coated magnetite microparticles in the solution to be extracted. Under optimized conditions, the magnetic MOF hybrid exhibits a fast adsorption rate and a high removal efficiency (>97 %) toward CR even over 15-fold reuse, which also features high adsorption capacity of 97.7 and 92.5 % for cationinc Methylene Blue (MB) and Crystal Violet (CV), respectively. The desorption of CR from the magnetic MOF was realized by washing it with ethanol and water. The material is considered to be a promising new adsorbent for use in wastewater treatment and in analytical preconcentration.
We report on a method for magnetization of a Cu-BTC metal-organic framework for use in rapid magnetic solid phase extraction of Congo Red from aqueous solutions. The material maintains its high removal efficiency (of >97 %) over 15 recyclable experiments.
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DESALINATION
·
2025
·
IF 9.8
Maliang Zhang,Huixin Lu,Yongyang Yin,Xiaotian Wang,Xi Du,Zhenhuan Li,Bowen Cheng
Due to their high porosity, many scholars have utilized two-dimensional (2D) materials for molecular separation. However, they need stability by relying only on the interactions between the 2D materials. Meanwhile, to promote the application of membrane separation technology in salt-containing printing and dyeing wastewater treatment, here we prepared a lamellar selective-layer crosslinked Cu-TCPP loose nanofiltration membrane. This membrane consists of a polyphenylene sulfide membrane as a substrate, which is loaded by tannic acid-modified and auxiliary-dispersed Cu-TCPP and stabilized by crosslinking by TMC. The crosslinking structure of polyester plays a critical role in the crosslinking and stabilization of the interlayer structure of two-dimensional nanosheets, and the retention rate of RhB dye can reach 99.8 %, with a lower retention rate for monovalent salt NaCl (<10 %) and divalent salt (<20 %). The original pore structure is also retained, and the maximum permeation flux could reach 27 L m −2 h −1 bar −1 . It possesses a high separation factor (α > 380) for NaCl/RhB mixed solution. In addition, the presence of a crosslinked structure gives the membrane better acid resistance, and it still has high selectivity for 16 h of continuous operation, achieving >98 % for methylene blue dye. This study provides a novel strategy to address nanosheet stability with potential applications in efficient salt/dye separation.
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LANGMUIR
·
2024
·
IF 3.7
Pengfei Bian,Huiqing Yang,Lexin Zhang,Zhiwei Liu,Guiying Qiao,Yong Han,Tifeng Jiao
Novel organic small molecule structures have received increasing attention in the preparation of multifunctional thin film materials and have become the subject of research in many cutting-edge directions. In this work, imidazolyl and transbutylene glycolic acid molecules and dye molecules were designed and prepared as composite films by supramolecular self-assembly in the LB technique, and their morphological features and spectral properties were analyzed. The results showed that the prepared LB films presented different aggregation states. In addition, their photoelectrochemical properties, on ITO sheets were tested, all of which showed good optoelectronic properties, and their binding energies, structure optimization, and electrostatic potentials were theoretically calculated by DFT simulations, which proved that the prepared films have good optoelectronic properties, and have the potential to become optoelectronic multifunctional ultrathin film devices.
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Nanomaterials
·
2024
·Vol. 14
·期 18
·1514
·
IF 4.4
Feifei Wang,Lei Ge,Lin Li,Tianyue Zhao,Tifeng Jiao
The LB films prepared through the Langmuir–Blodgett (LB) technique are of significant importance for the fabrication of functional films such as optoelectronic materials and sensors. In this study, 9,9-bis (4-(2-hydroxy-ethoxy) phenyl) fluorene (BPEF) and 9,9-bis [3-phenyl-4-(β-hydroxy-ethoxy) phenyl] fluorene (BBPEF) were combined with saffron T (ST), methylene blue (MB) and Rhodamine B (RhB) dyes by LB technique to prepare ordered composite films. The nanostructures and morphologies of the composite films were analyzed by transmission electron microscopy (TEM) and atomic force microscopy (AFM). It was found that the films exhibited distinct aggregation morphologies. The UV-VIS absorption spectra showed that the concentration of dye molecules had a significant effect on the spectral characteristics. The contact Angle test shows that the prepared composite films are hydrophobic. The photovoltaic conversion performance of LB composite films was studied by transient photocurrent response experiments. It was found that BPEF/dye and BBPEF/dye composite films exhibited significant responses in photocurrent. In particular, BPEF/RhB and BBPEF/RhB composite films demonstrated excellent photoresponsive performance. This study used LB technology in combination with BPEF and BBPEF to demonstrate enhanced photocurrent and stable performance of LB film, which provided ideas for expanding the application range of materials.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xinjuan Zeng,Mengkang Lu,Zihao Xu,Zongyuan Lin,Fangqing Fan,Yuxuan Xia,Wei Li,Min Zhang,Ting Chen,Cailong Zhou
Rapid and efficient separation of dyes from water is a formidable challenge due to the trade-off between separation selectivity and permeability. Here, a novel superhydrophilic copper foam (CF) enabling the rapid and efficient filtration of cationic dyes from water is reported. The fabrication involves brushing a coating consisting of attapulgite (APT), poly(vinyl alcohol) (PVA), TiO 2 and glutaraldehyde (GA) onto copper foam and then heating. The obtained copper foam (CF-PVA/GA@APT/TiO 2 ) is superhydrophilic and negatively charged with dye adsorption capability. The interconnected cage-shaped porous structure endows the foam with long tortuous permeation channels and large pore size. It is able to separate various cationic dyes with a separation efficiency reaching to 99.93 % and a permeation flux up to 1671 ± 189 L m -2 h −1 under gravity. Furthermore, the CF-PVA/GA@APT/TiO 2 can realize the selective separation and recovery of various cationic dyes from rhodamine B (RhB)-mixed dye solutions. Molecular dynamics-based computational modeling and experimental studies revealed that the interaction energy between the surface of CF-PVA/GA@APT/TiO 2 and methylene blue (MB) is much stronger than that of the former and RhB, leading to adsorption of MB in the permeation channel, while RhB gradually migrates through the permeation channel and passes through the channel with water. The tortuous permeation channels of CF-PVA/GA@APT/TiO 2 increase the contact area and absorption opportunities for cationic dye molecules on the surface, and its large pore size maintains the filtration flux. These properties provide the as-prepared foam with excellent potential applicability for industrial dye wastewater treatment.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Wenhui Gu,Pengfei Bian,Liu Wang,Xinyu Li,Zhiwei Liu,Lukang Ji,Mingli Wang,Tifeng Jiao
Artificial supramolecular materials have found extensive applications in many fields such as biology, chirality, and information science. The Langmuir-Blodgett (LB) film technology, as an effective means of molecular assembly, offers broad prospects for the preparation of functional materials with specific properties. This study focuses on a chiral and amphiphilic molecule - the glutamine-azobenzene molecule (GAZS) composite Langmuir-Blodgett film. Through the LB technique, GAZS molecules were successfully compounded with MB, ST, and RhB subphases to form multi-layer films. The interfacial aggregation behavior of this film was thoroughly explored, and its morphological characteristics and spectral properties were analyzed. The results show that the LB films which are prepared exhibit the same J-aggregation state. The surface-enhanced Raman scattering (SERS) experiment shows that the composite LB films which are prepared have outstanding Raman enhancement performance, with an enhancement factor (EF) of 2.46 × 10 5 . Additionally, the Raman intensity has a relative standard deviation of 12.30 %, which implies that the composite films possess excellent reproducibility and uniformity. Thus, they are suitable for the detection of trace molecules. The circular dichroism spectroscopy proves that the LB films formed after the combination of GAZS molecules and dye subphases exhibit obvious chiral signals, providing some insights into the performance research and application expansion of chiral photo-supramolecular material composite LB films. Through the photoelectric conversion test of transferring multi-layer films onto indium tin oxide (ITO), it is found that the self-assembled LB films exhibit outstanding photoelectrochemical characteristics. The GAZS molecules show a more powerful photoelectric conversion effect. under the RhB subphase, providing a reference for the further exploration of the applications of GAZS molecule composite LB films in optoelectronic devices.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaxia Yang,Linyan Yao,Xiuxia Sun,Lili Wang,Jianxi Xiao
Digital Light Processing (DLP) bioprinting has revolutionized tissue engineering and regenerative medicine with its speed and precision. Although commonly used in DLP printing, Gelatin Methacrylate (GelMA) lacks the mechanical strength and complex biological signaling of collagen, owing to the absence of collagen’s unique triple helix structure. However, collagen faces challenges such as denaturation at high temperatures and aggregation at neutral pH, limiting its use as a bioink. Herein, we present for the first time the development of a low-temperature DLP 3D printing technique using low-concentration Collagen Methacryloyl (ColMA) for fabricating durable and bioactive personalized scaffolds. Our study shows that pH significantly influences ColMA printing, with pH 3 producing low-concentration scaffolds that exhibit enhanced mechanical properties, minimal swelling, and prolonged resistance to enzymatic hydrolysis compared to high-concentration GelMA scaffolds, while low-concentration GelMA cannot be printed independently. ColMA scaffolds notably boost the proliferation, adhesion, migration, and differentiation of human foreskin fibroblasts. In vivo rat model tests demonstrate that ColMA scaffolds reduce inflammation, enhance collagen deposition, and accelerate epidermal regeneration. This method offers a robust solution for low-temperature DLP 3D printing of collagen ink, facilitating the creation of personalized scaffolds with superior bioactivity and representing a significant advancement in tissue engineering applications.
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